A new understanding of antiageing vichy scientists have identified the new liftactiv supreme derm source as one of the most important layers of the skin in determining skins youthfulness activity that takes place in the derm source has a powerful effect throughout the upper layers of the skin its the driving force behind the renewal of epidermal skin cells skin fibres and vital connections between the superficial skin layers vichy liftactiv derm source antiwrinkle and firming action for ski